| 1.) The property of following magnetic lines of force through material is | |
| A) | relative permeability |
| B) | permeability |
| C) | intensity of magnetisation |
| D) | susceptibility |
| 2.) The magnetic length of a bar magnet is 10cm. Its geometric length is | |
| A) | 10 cm |
| B) | 12 cm |
| C) | 5 cm |
| D) | 6 cm |
| 3.) Screens to prevent the magnetic effects are made of | |
| A) | Glass |
| B) | Wood |
| C) | Iron |
| D) | Brass |
| 4.) A bar magnet of magnetic moment 5A-m2 has poles 20 cm apart its pole strength si | |
| A) | 50 A-m |
| B) | 15 A-m |
| C) | 25 A-m |
| D) | 45 A-m |
| 5.) In working with deflection magnetometer, the proportional error will be minimum when the deflection is | |
| A) | o‘>30o |
| B) | o‘>45o |
| C) | o‘>60o |
| D) | o‘>90o |
| 6.) A magnetised wire of moment 1.57 Am2 is bent in the form of a semicircle. The new magnetic moment will be | |
| A) | 2‘>0.1 Am2 |
| B) | 2‘>10 Am2 |
| C) | 2‘>1 Am2 |
| D) | 2‘>110 Am2 |
| 7.) Two small magnet produces no deflection when placed at 10cm and 20cm respectively on the two arms of a deflection magnetometer. The ratio of their magnetic moments is | |
| A) | 1:4 |
| B) | 1:8 |
| C) | 8:1 |
| D) | 4:1 |
| 8.) The ratio of magnetic inductions at distances r1 and r2 from a magnetic pole is___ | |
| A) | 1 : r2‘>r1 : r2 |
| B) | 2 : r1‘>r2 : r1 |
| C) | 22 : r21‘>r22 : r21 |
| D) | 1 : 1 |
| 9.) The time period of a magnet at a place of magnetic field 4B is T. Time period at a place where magnetic field is B is | |
| A) | 2T |
| B) | 3T |
| C) | 4T |
| D) | 16T |
| 10.) Which of the following is best for permanent magnets is | |
| A) | alnico |
| B) | iron |
| C) | steel |
| D) | Brass |
| 11.) A magnetic field is produced and directed along y-axis. A magnet is placed along x-axis. The direction of torque on the magnet is | |
| A) | in the x-y plane |
| B) | along y-axis |
| C) | along z-axis |
| D) | Torque will be zero |
| 12.) The best method for demagnetisation is | |
| A) | Dropping the magnet from some height |
| B) | Hammering the magnet |
| C) | Heating the magnet |
| D) | Sending alternating currents through the magnet |
| 13.) Deflection magnetometer works on | |
| A) | Coulomb’s law |
| B) | Curie law |
| C) | Tangent law |
| D) | The law of vibration of a magnet |
| 14.) Find out the wrong statement | |
| A) | The lines of force may intersect |
| B) | The lines of force never intersect |
| C) | The tangent drawn to the line of induction at any point gives the direction of magnetic induction at that point. |
| D) | None |
| 15.) Vibration magnetometer works on the principle of | |
| A) | Torque acting an the bar magnet |
| B) | Force acting on the bar magnet |
| C) | Both the force and the torque acting on the bar magnet |
| D) | None of the above |
| 16.) The ratio of intensities of magnetic fields due to a short magnet in tan A and tan B position at the same distance is | |
| A) | 1:2 |
| B) | 2:1 |
| C) | 2:3 |
| D) | 1:4 |
| 17.) The acceleration aquired by the pole in the above problem is___ | |
| A) | 2‘>2 m/s2 |
| B) | 2‘>20 m/s2 |
| C) | 2‘>4 m/s2 |
| D) | 2‘>40 m/s2 |
| 18.) Two magnets have their length in the ratio 2:3 and their pole strengths in the ratio 3:4. the ratio of their magnetic moment is | |
| A) | 2:1 |
| B) | 4:1 |
| C) | 1:2 |
| D) | 1:4 |
| 19.) The distance at which resultant induction becomes zero on the line joining the poles in the above problem is | |
| A) | doesn’t form |
| B) | 5cm |
| C) | 10cm |
| D) | 15cm |
| 20.) In the above problem, The distance of each pole from the nearest end is | |
| A) | 2 cm |
| B) | 4 cm |
| C) | 1 cm |
| D) | 5 cm |
| 21.) Magnetic induction at a point in air at a distance 6cm away from a pole of strength 9 A-m is | |
| A) | -3 T’>2.5 x 10-3 T |
| B) | -2 T’>2.5 x 10-2 T |
| C) | -5 T’>2.5 x 10-5 T |
| D) | -4 T’>2.5 x 10-4 T |
| 22.) Two points A and B are located at equal distances from the centre of the short magnet on the axial line and equitorial line. The ratio of inductions at A and B is | |
| A) | 1:1 |
| B) | 2:1 |
| C) | 1:2 |
| D) | 4:1 |
| 23.) Two magnetic poles of strength 2 A-m each are separated by 10cm in air. The force between them is | |
| A) | -5 N’>0.4 x 10-5 N |
| B) | -5 N’>0.04 x 10-5 N |
| C) | -5 N’>4 x 10-5 N |
| D) | -5 N’>40 x 10-5 N |
| 24.) The time periods of a magnet in two fields are 1s and 4s, compare the two fields. | |
| A) | 4:1 |
| B) | 16:1 |
| C) | 1:16 |
| D) | 1:4 |
| 25.) The moments of inertia as well as the time periods of two magnets are in the ratio of 1:2. The ratio of their magnetic moments is | |
| A) | 2:1 |
| B) | 1:2 |
| C) | 4:3 |
| D) | 3:4 |
Showing posts with label EAMCET. Show all posts
Showing posts with label EAMCET. Show all posts
Saturday, November 8, 2008
magnetism
sound
| 1.) Longitudinal waves cannot be travel through | |
| A) | solids |
| B) | liquids |
| C) | gases |
| D) | vaccum |
| 2.) The echo and original sound differ in | |
| A) | Frequency |
| B) | Velocity |
| C) | Intensity |
| D) | wavelength |
| 3.) The type of the waves which cannot be transmitted through fluids | |
| A) | longitudinal waves |
| B) | transverse waves |
| C) | electromagnetic waves |
| D) | Progressive waves |
| 4.) Sound travels in rocks in the form of | |
| A) | non-elastic waves |
| B) | only transverse elastic waves |
| C) | only longitudinal elastic waves |
| D) | both longitudinal and transverse elastic waves |
| 5.) The waves which require material medium for their transmission are: | |
| A) | Body waves |
| B) | Mechanical waves |
| C) | Sound waves |
| D) | All the above |
| 6.) The phase differrence between two particles equidistant and lining on either side of a node is | |
| A) | o‘>0o |
| B) | o‘>45o |
| C) | o‘>90o |
| D) | o‘>180o |
| 7.) The property of a progressive wave that does not depend up on other characteristics | |
| A) | Amplitude |
| B) | Frequency |
| C) | Wave velocity |
| D) | wavelength |
| 8.) Hydrophone is based on | |
| A) | Beats |
| B) | Echo |
| C) | Droppler effect |
| D) | Super position of sound waves |
| 9.) Doppler effect is applicable to | |
| A) | Sound waves |
| B) | Light waves |
| C) | Radio waves |
| D) | All the above |
| 10.) An open window acts as | |
| A) | Perfect reflector |
| B) | perfect absorber |
| C) | Both 1&2 |
| D) | neither 1 nor 2 |
| 11.) Multiple reflections are observed in | |
| A) | Stethoscope |
| B) | Reverberations |
| C) | Diffraction |
| D) | Both 1&2 |
| 12.) What determines the frequency of natural oscillations of system | |
| A) | inertia |
| B) | elasticity |
| C) | mode of vibrations |
| D) | All the above. |
| 13.) Resonance is a special case of | |
| A) | free vibrations |
| B) | forced vibrations. |
| C) | Damped vibrations |
| D) | Maintained vibrations |
| 14.) The longitudinal wave velocity in solids in bulk | |
| A) | does not depend on wavelength and frequency |
| B) | depends on bulk modulus ‘k’ and rigidity modulus ‘n’. |
| C) | both |
| D) | none |
| 15.) Sound waves can diffract easily because | |
| A) | The wave length is very very small |
| B) | The wave length is more |
| C) | It can reflect |
| D) | It can refract |
| 16.) The echo and original sound have same | |
| A) | Frequency |
| B) | Amplitude |
| C) | Intensity |
| D) | All the above |
| 17.) The longitudinal waves in air differ from the electromagnetic waves in that they cannot be | |
| A) | Reflected |
| B) | Refracted |
| C) | diffracted |
| D) | polarised |
| 18.) The persistance of sound in a hall is called | |
| A) | resonance |
| B) | acoustics |
| C) | reverberations |
| D) | articulation |
| 19.) Incase of damped oscillation amplitude | |
| A) | decreases linearly |
| B) | increases linearly |
| C) | decreases exponentially |
| D) | increases exponentially |
| 20.) If a string is vibrating in nth harmonic the total number of nodes produced is | |
| A) | n-1 |
| B) | n+1 |
| C) | n+2 |
| D) | n-2 |
| 21.) The waves which do not require any material medium for the propagation are: | |
| A) | Matter waves |
| B) | Debroglie waves |
| C) | Electromagnetic waves |
| D) | Surface waves |
| 22.) If a stretched string is plucked at the centre | |
| A) | even harmonics are present |
| B) | odd harmonics are absent |
| C) | even harmonics are absent |
| D) | All harmonics are present |
| 23.) When a tuning fork is heated its frequency | |
| A) | increases |
| B) | decreases |
| C) | remains same |
| D) | become erratic |
| 24.) At resonance | |
| A) | The amplitude is maximum,theoretically infinite |
| B) | The amplitude is minimum |
| C) | Amplitude is zero |
| D) | Amplitude is either zero or minimum |
| 25.) If a string be rubbed along its length,the vibrations are | |
| A) | transverse |
| B) | longitudinal |
| C) | both 1 and 2 |
| D) | neither 1 nor 2 |
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